Kenton County Police detective Stephen Benner, with his 'Wall of Shame,' showing mug shots of people arrested as a result of his work posing online as a 13-year-old girl. The Enquirer/Patrick Reddy

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For Stephen Benner, keeping a chart of girls' underwear sizes by his office desk and chatting with men soliciting sex is all in a day's work.

When he's not backing up his fellow police officers on a call, the 52-year-old member of the federal Internet Crimes Against Children Task Force is on his computer portraying himself as a 13-year-old girl on the web.

His goal? To stop sexual predators from preying on the most vulnerable members of society. ...